In one on the compounds that contains only oxygen and nitrogen, 3.50 g of nitrogen combines with 2.00 g of oxygen. In another, 0.875 g of nitrogen combines with 1.00 g of oxygen. Show that these compounds obey the law of multiple proportions.

Explanation:

The law of multiple proportions states that if two elements X and Y combine together to form more than one compound, then the several masses of X which chemically combine with a fixed mass of Y is in simple ratio.T

FIRST CASE ;

Molar mass of Nitrogen gas = 28 g/molNumber of moles of Nitrogen gas = Mass/molar mass = 3.50/28 = 0.125 molesNumber of moles of Oxygen gas = Mass/molar mass = 2.00/32 = 0.0625 molesHence the ratio of number of moles of N2 to O2 will be 0.1295 : 0.0625 or 2:1Similarly for the SECOND CASE ; Molar mass of Nitrogen gas = 28 g/molNumber of moles of Nitrogen gas = Mass/molar mass = 0.875/28 = 0.03125 molesNumber of moles of Oxygen gas = Mass/molar mass = 1/32 = 0.03125 molesHence the ratio of number of moles of N2 to O2 will be 0.03125 : 0.03125 or 1:1

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .